Until level 10 everything went smooth. I had the feelling that 1 in 3 I had to repeat and ok. Within some days an awful lot of skills lost its golden segments. I have done more than 30 sections of repetitions and I still have not regained everything on full sections. I am really frustrated. Sorry if my English sounds strange. My mother tongue is German.
Are you practicing through the "Strengthen skills" button?If so you may wanna practicing each lesson separately.I had three non-golden lessons the other day and did more than five skill-strengthening lessons without getting any of them back to gold.But when I went to each lesson separately they went back with the first time.
Maybe that's the reason. I must try. Another reason could be, the they had updated the IOS app. At the moment I am seem to be drowningnin repetition. Can you imagine what happens if you have made 100 xp points at one day and falling bachwards in your golden tree?
Duolingo wants you to get it stuck in your brain. More than 30? Ouch. Good luck!